Improvement in gfunding-mills



J. D.. WHELPLEY 8u J. J. STEER.

GRINMNG Mlm.l

Emma Nw. 85 iss@ Murau, o. c.

v UNITED STATES ATENT Genion.

JAMES D.WHELPLEY AND JACOB J. STORER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN GRiNDING-MILLS Specification forming part of Letters Patent No. tid-1,92) 0, dated Novemb'cij Fi, 1864.

To all whom 'it may concern Be it known that We, J. l). VVHELPLEY and J. J. STORER, of Boston, in the county of Suffolk and State of Massachusetts, have invented anew and useful Improvement in Grinding- Mills; and wel do hereby declare that the following is a full, clear, and exact description ofthe construction and operation ofthe same, reference being had to the accompanying` drawings, formin g a partof this specification, in which- Figure lis a top view; Fig. 2, avertical section in the line .r of Figuvl; Fig. 3, a diminished end elevation, &c. 5 Fi g. 4, a section (enlarged) through one of the bea-ters.

Like parts are indicated by the sameletters in all the drawings.

Our present invention is intended to be an improvement on the patent granted to us on the 30th dayoi September, 1862, under which we have been operating the past three years, and it consists, first,in the employment of a return-pipe, furnished with a valve or regulator, lending from the eollecting-chamber into the hopper, for the purpose of relieving the pressure of air in the chamber when said pipe is used in combination with a grinding-mill provided with a central opening or delivery second, in a graduating feeder, whereby more or less material may be fed into the mill, and coarser or finer; third, in the employment at the bottom of the mill of a trap-door, i', for the purpose' of letting down heavy particles or lumps of met-al collected in the mill when the latter is in motion, while the dust and lighter particles-,are carried away by the blast of air through the central delivery; fourth, in thc employment of rotating arms Q, either with or without brushes attached in front oij' the sieve S, for the purpose of keeping it from clogging; fifth, in the employment of an adjustable valve, j", 'in the return-pipe for the purpose of regulating the return of thc air, and consequently the quantity and quality ot' the yield 5' sixth, in introducing steam into the collecting-chamber or fan-blower, or any part of the mill, for the purpose of condensing and settling the line dust seventh, in construct-ing the beaters with broad faces (from three to ten inches broad) to move as closely as possible to the sides of the mill, and at a distance of one inch (morevor less) from its.

periphery,y for the pu rposc of con luin g the air in the mill (except as drawn out at the central hole) and giving it a rapid rotary motion, so that the coarse particles shall be kept out near the periphery of the mill by the rapid rotary motion of the air and the beaters, while the iiner particles and dust shall be drawn out from the central opening or delivery; eighth, in the employment of an adjustable valve to regulate the exit of air from the fan-blower; and, ninth, in furnishing the plate or dish L, which distributes the air, with perforations w near its center, to serve as a sieve, through which the dust from the return-pipe may be passed into the center of the mill and returned to the chamber without clogging the action of the hammers. To enable others skilled in the art to make and use our invention, we will now describe its construction and operation.

A is the foundation or form on which tin mill is placed.

B is the periphery of the grinding-cylinder; and G C are its'sides, constructed, of iron, substantiallyr as described in the patent alluded to above.

D is a central hole in one side ,f the cylinder, through which the materials o be ground are fed from the hopper F into the mill, and E is a similar central hole in the other side of the mill, through which the nely-powdered snaterials are drawn outI into the conductor N by the fan-blower P.

I is a horizontal shalt turning in suitable bearings in the form.A, and J is its drivingpulley.

K is the hub of the beateravheel fast to the axle l.

Lisa disk, fast to one end ot' the hub l and provided with perforations w near its ccnter, as shown in Fig. 2, for the purpose de scribed above, said perforations being from one-half inch to two inches in diameter, and having aeombincd area equal that of the return-pipe.

L is a disk, of the. same diameter as L, attached to the opposite end of the hub K, but provided with large holes'rl round the center l'or the delivery of air and dust.

M are the beaters, coniined to and between the'disks L L, as shown in Fig. 2. These beaters we construct from three to ten inches deep, after the manner of a fan-blower, for the purposes specified above.

o o are screw bolts passed through the 'wrought-iron plate, as shown in Fig.'4, before the cast-iron is chilled upon it, byineans of which bolts and suitable nuts the beaters are secured to start from the disks L and L.

S isa sieve ot wiregauze or perforated ,metal, situated between the conductor N and the shell 0 of the blowe'r, as represented in Fig. 2, the object of said sieve' being to pre-- vent particles too large from being-accident-V ally thrown out o f the mill.

Q are rotating arms, (either with or without brush es attached thereto,) fast to the axle I, as shown in Fig. 2, and moving very near to the sieve S, to keep the latter from clogging with dust. U, Fig. 1, is a pipe leading from the periphfry of the fan-blower into the collectingchamber T, the`sides of which are covered with cloth, as and for the purpose described l be; rllto the lower part of the hopper F, and

fi i an adjustable valve iny said pipe, the design of ldth of which has been described above.

G is the -box or hopper into which `the mafte ial to be ground isthrown.

H is thefeeding-cylinder, situated, as seen in Fig. 2, at the bottom of the hopper G, turning-in suitable bearingsl in'its sides, an'd driven by the pulley h. (See Fig.. 3.) -This -oylinder H -is provided with longitudinal grooves or'teeth, as shownin Fig.'2.

a is a piece of sheet metal' attached to the one side of the hopper G, so that its lower e'ge .shall all but touch the periphery of the cylinder H, as represented in Fig. V2,-

b is a' iat spring vofsheet metal or its rq'uivalent, attachedl one side of the hopper G and extending' down below the center of the cylinder H, and nearlytouching the same,

as shown in Fig. l2.

c is aset-screw, by means of which the springplate bmay be adjusted nearer to the cylinder I H or farther from it, as may be desired. 'As the cylinder H revolves toward the spring-ta-y ble b, thelatter will yield a little whenever a particle too large is brought against it by the cylinder H, and thus allow it to pass'down instead of clogging.

e is a-n adjustable'. sliding cover, by means of which the-quantity of material fed into the mill may be'regulated. l(see Fig. 3) is a tra-p door hinged at one end to the bottom of the periphery B of the mill, the free end being provided with a lever,

j, by means o f which the said trap-door lmay be readily opened or closed by the attendant whilethe mill'is in motion, and for tle purpose speciied above.

k is a catch, lontowhich the lever j is hooked,

for the purpose .of supporting the trap-door and keeping it closed.

We do n ot claim, broadly, the employmen t ot a return-pipe for the purpose of causing acirculation of air or water through and through a mill or machine independently of our particular combination, as such pipes have been' long in general use; but

W hatl we do claim as new, and desire to s ecure' by Letters Patent, is

l..l The employment of an adjustable valve,f, in a return-pipe, V, for regulating the quality and quantity-ofv the yield, substantially as described..

.2. The employment of the trap-door z', the grooved cylinder H, the spring-plate b, the slide or cover e, and the beaters M, in combination with the grinding-mill, all constructed and arranged substantially asset forth.

'3. Introducing steam into ythe collecting chamber, fan-blower, or any part of the mill,

for the purpose described.

JAMES DQWHELPLEY. AJACOB J. sroaun. Witnesses:

N. AMES, A. F.- BADGER. 

